CSAT 2020

Q. What is the remainder when 51 x 27 x 35 x 62 x 75 is divided by 100?

(a) 50
(b) 25
(c) 5
(d) 1
Correct Answer: (a) 50

Question from UPSC Prelims 2020 CSAT Paper

Explanation :

Remainder when 51*27*35*62*75 divided by 100

To find remainder when divided by 100:
Take ones place digit of each number: 1, 7, 5, 2, 5
Multiply them: 1 × 7 × 5 × 2 × 5 = 350
Find remainder when 350 ÷ 100 = 50 (remainder)

Therefore, when 51 × 27 × 35 × 62 × 75 is divided by 100, the remainder is 50.

Answer: (a) 50

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